If oil is circulating properly despite an oil pressure warning light, the oil pressure switch may be bad.
Harley-Davidson motorcycles use a high-volume, low-pressure oil system to lubricate their signature V-twin engines. This lubrication system is also responsible for helping to keep the bike cool. As such, proper functioning of the oil pump and affiliated components is essential to the life of the motorcycle. If an oil pressure warning light comes on and the oil appears to be circulating properly, then it may be necessary to change out the oil pressure switch. The length of time to complete this task should be between 30 to 60 minutes.
1. Remove the seat by loosening and removing the rear seat fastener with a cross-tip screwdriver. Disconnect and remove the positive and negative battery cables with a 10 mm open-ended wrench.
2. Pull back the rubber boot covering the oil pressure switch to expose the wire connection. Loosen the nut securing the wire on top of the switch with an SAE open-ended wrench. Pull the wire off the switch.
3. Unscrew and remove the oil pressure switch with a standard pair of pliers. Carefully clean the threads of the insertion hole with a clean shop rag.
4. Insert a new oil pressure switch into its hole. Tighten with a pair of pliers, being careful not to over-tighten. Attach the positive wire connector to the top of the new switch. Slip the protective rubber boot down so that it covers the connection.
5. Reconnect the battery cables and reinstall the seat.